Ask HN: Tag-based personal document management systems?

Dear HN,

I'd like to ask if anyone has recommendations for a document management system for private usage.

My use-case is as such:

- we have a capable multi function print/scanner scanning to a Synology NAS

- we have a plethora of docs which don't categorize neatly

- we would like to be able to "tag" documents as "insurance", "health", "husband", "wife", "kid1", "germany", "private" rather than be forced to pick one category for them.

I don't really mind what the solution looks like, but something like macOS file tags are too "fragile" and likely to be overwritten by a careless copy from my terminal, or not survive over a SMB network mount, or similar.

My first instinct was to write something, moreso when looking around and seeing that all document management systems I found seemed to be geared towards big businesses, and were horribly complicated, expensive and cumbersome with nasty UIs.

For our volume (a few thousand docs each year, tops) a FUSE filesystem which supported extended attributes and maintained a CAS database of file hash to "tag" and exposed the tags as directories would work beautifully I expect, but I don't want to reinvent a wheel if I can avoid it.

Any recommendations HN?